Sandpapering and polishing machine



F. A. OEHM.

SANDPAPERING AND POLISHING MACHINE.

APPLICATION IILED SBPT.2. 1908.

Patented June 22, 1909.

2 SHEETS-SHEET 1.

AZORNEY r. A. OEHM. SANDPAPERING AND POLISHING MACHINE.

APPLICATION FILED SEPT. 2. 1908.

925,942, 7 Patented June 22, 1909.

2 SHEETS-SHEET 2.-

WITNESSES UNITED sTA Es PATENT OFFICE.

FRANKLIN A. OEHM, OF SAN FRANCISCO, CALIFORNIA.

SANDPAPERING AND POLISHING MACHINE.

To all whom it may concern:

Be it known that I, FRANKLIN A. OEHM, a c tlzen of the United States,residing in the city and county of San Francisco and State ofCalifornia, have invented new and useful Improvements in Sand aperingand Polishlng Machines, of whicfl the following is a specification.

My invention relates to a machine for sandpapering and polishingsurfaces which require such finish, and pertains es ecially to a machinefor giving a surface finish to moldrugs and like irregular surfaces.

The object of the invention is to provide a simple, practical machinewhich can be manufactured at a comparatively small cost, and which willoperate on moldings and the like more efficiently than the machines nowcommonly in use, in that with my machine I am able to work into all thecorners and angles of the surface to be polished, instead of roundingoff these angles or failing to get into the rentrant angles as is nowthe case with the machines in use; also to render the machine readilyadaptable for moldings of any width or thickness.

The invention consists of the parts and the construction and combinationof parts as hereinafter more fully described and claimed, havingreference to the accompanying drawings, in which Figure 1 is a sideelevation of my machine. Fig. 2 is a front end View of same. Fig. 3 isan enlarged view of one end of the pressure shoe. Fig. 4 is a section online XX of Fig. 3.

A. represents a frame of any suitable size, shape and material,supporting the working parts of the machine.

The polishing devices comprise a series of sections or blocks 2 suitablymounted on a suitable endless carrier 3 runnin over pulleys 4whichlatter are appropriately mounted Specification of Letters Patent.

Application filed September 2, 1908.

Patented June 22, 1909.

Serial No. 451,408.

These polishing blocks may be attached to the carrier in any suitableway. Preferably they are secured to the outer surface of the belt bymeans of metal plates 6 which are secured to the belt, and which lateshave their ends bent outwardl from t e belt and over the sides of the bocks with the extremities of the plates 6 bent inwardly to provideflanges 7 which engage in corres onding lateral grooves 8 in the blocks.

he back of each block is provided with a transverse groove 9 in whichsuitable locking means, as the screws 10 passing through the belt andthrough a plate 6, engage. The plates 6 with their flanges 7 allow theblocks to be readily inserted in position on the belt before the belt isut on to the machine, by simply bending tfie belt back and slipping theblock on over the flanges 7; then by screwing in the screws 10 so as toengage in the grooves 9, any lengthwise dis lacement ofthe blocks afterbeing assemb ed is prevented. This removability of the blocks isnecessary, because after a certain amount of use the surface of a blockbecomes worn smooth so that the block has to be taken out and resurfacedwith sandpaper or other abrasive material. Meanwhile, other blocks canbe placed on the same belt and the machine continue its 0 erations. Thismethod of attaching the b ocks to a flexible belt provides for thenecessar articulation of the locks in passing aroun the pulleys 4.

The material or molding represented at 11, and which is to be olished,is supported on a suitable table or B through the machine in a contrarydirection to the travel, and in the plane, of the pohshing members 2.The feed of the material is accomplished by an appropriate means, as thecoacting feed ro lers 1314 at the head end of the machine. The lowerfeed roller is provided with a corrugated feeding surface and isadjustably mounted in the frame below the bedlate, as shownin Fig. 1.The upper feed ro ler 14 which is desi lied to bear on the irregularsurface of the mo dlng 1s preferabl of soft rubber or other suitablecompositlon which will adapt itself readily to tho elevations anddepressionsof the molding. This feed roller 14 is adaptable to differentthicknesses of material, by reason of the fact that it is journaled in abracket 15 carried on the weighted arm 16 which latter issuitablyfulcrumed, as represented at 16.

Appropriate motion is given to the feed two pulleys 1819. A belt 20connects pulley 18 with another pulley 21, the'shaft of which latter hasa sprocket around which runs a chain 22. his chain 22 passes around asprocket on the shaft of the roller- 13 and thence around an idlesprocket 23. The shaft of sprocket 23 has a gear 24, Fig. meshing withgear 25 on the shaft of the roller 14. The result is that the contiguoussurfaces of the feed rollers 1314 travel in the same direction. Theshaft of roller 14 carries a sprocket 26 around which passes a chain 27which runs back to a rear roller 28 of rubber or the like, by which thefinished molding strip is discharged from the machine. The polishingcarrier 3 is driven from the pulley 19 on shaft 17 by suitableconnections, as the belt 29; it being understood that the blocks 2 inpolishing contact with the molding travel toward the front of themachine, while the molding is .moving toward the rear.

The molding in passing through the machine is laterally supportedbetween the guides 30,-31, one of which, as 31, is made adjustable byappropriate means, as the screws 32. The carrier 3 carrying thepolishing blocks is adjusted to bear with the right pressure on themolding by appropriate means, as the shoe 33 which bears on top of thelower plane of the carrier, and which is adjustable up and down on'theframe by appropriate means, as the set screws 34 engaging in the slots35 of the brackets 36 which carry the shoe. This shoe 33 has thedownwardly projecting lateral guides 37'.38 one of which, as 38, isadjustable by means of the screw 39 to adapt the shoe to carriers andblocks of different widths.

It is understood that for different moldin 's a diflerent carrier anddifferent type of po ishing block are required. Also, as moldings are ofdifferent thicknesses, I have designed this machine so as to adapt it toall practical purposes. Consequently, by raising or lowering the shoe 33the machineis adapted to moldings and blocks of different thicknesses,and by moving the adjustable guide late 38 on' the shoe, and likewiseadjusting t e guide 31 on the bed-plate, the ap aratus is ada ted toblocks and moldings 0' different wi ths.

Any appropriate form of belt-tightening means (not necessary here to beshown) may be employed in conjunction with one or other of the pulleys 4to secure the right tension on the carrier 3, according to theadjustments up or down of the shoe 33.

Having thus described my invention, what I claim and desire to secure byLetters Patent is 1. In a polishing machine, the combination of anendless traveling belt, a series of blocks having polishing surfacescorresponding in cross-section to the surface of the material to .bepolished, said belt and blocks having co-acting flanges and grooves, awork support, and means for feeding the work. in a direction opposite tothe travel of the belt.

2. In a polishing machine, the combination of .an endless carrier and aseries of separable, independently removable polishing sectionsor'blocks, said belt and blocks having co-acting side flanges andgrooves.

3. In a polishing machine, an endless belt provided with plates havininturnedflanges, polishing sections or blocks having lateral grooves tofit the flanges, and locking means carried by the belt engagingtransverse grooves in the sections.

4. In a polishing machine an endless belt provided with plates havininturned flanges, polishing sections or bloc s having lateral grooves tofit the flanges, locking means. carried by the belt engaging transversegrooves in the sections, a work-supporting table with means for guidingand feeding the work to be polished to the sections, and a verticallyadjustable shoe acting on the belt to press the sections on to the work.

5. In a polishing machine, an endless belt provided with plates havininturned flanges, polishing sections or bloc s having lateral grooves tofit the flanges, locking means carried by the belt enga ing transversegrooves in the sections, a wor -supporting table with lateral guidesengaging the sides of the sec- .tions, and means between the guides toaccommodate the shoe or, varying the distance to different widths ofbelt and sections.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

FRANKLIN A. OEHM. Witnesses:

ENGELHARD OEHM. J. D. HEISE.

